Process for the manufacture of a substitute for sericin soap.



" ES PTENT OFFICE.

PETER SCHMID, 0F BASEL, SWITZERLAND.

IPROCESS FOR THE MANUFACTURE OF A SUBSTITUTE FOR SERICIN SOAP.

No Drawing.

To all whom it may concern:

Be it known that I, PETER SCHMID, a citizen of the Swiss Republic, and resident of Basel, Switzerland, have invented a new and useful Process for the Manufacture of :1 Substitute for Sericin Soap, of which the following is a full, clear, and exact specification.

In the specification of the United States Letters Patent No. 1,199,434, dated September 26, 1916, is described a manufacture of a substitute for sericin soap for use in dyeing silk, silk-waists, silk spuns and silk tissues, wherein silk worm chrysalides or silk wastes containing silk worm chrysalides are boiled with water, to which carbonate of soda may be added to saponify the oils in the chrysalides.

The present invention relates to an improvement in or modification of the invention described in the said specification and consists in adding to the water used for'boiling the chrysalides, a small proportion. of a mineral acid, such as sulfuric acid, instead of sodium carbonate. The acid water acts upon their oils and dissolves the chrysalides more quickly than the alkaline Water does and at the same time prepares the sericin soap substitute for its subsequent use in dyeing: very essential advantages accrue from this preparation;

The added acid which has already all-- filled one function, passes with the substitute into the dye bath and produces a slightly acid bath without further addition. Its close union with the chrysalides insures that it enters the dye bath in the best condition for distribution so that uniformity of dyeing is promoted, even if subsequently Specification of Letters Patent.

Patented Nov. 5, 1918.

Application filed February 15, 1918. Serial No. 217,381.

been made with aid of acid orsodium carbonate, to add wit a small proportion of soap, such as 175-350 grams of soap per 2,000 liters of dye bath; by such an addition uniform dyeing is rendered still more certain. v

What I claini is:

1. The herein described process for the manufacture of a substitute for sericin soap for use in dyeing silk, silk wastes, silk spuns and silk tissues, which process consists in boiling silk worm chrysalides with water to which. a small proportion of a mineral acid has been added.

2. The herein described process for the manufacture of a. substitute for sericin soap for use in dyeing silk, silk wastes, silk spuns and silk tissues, which process consists in boiling silk wastes containing silk worm chrysalides with water to which a small proportion of a mineral acid has been added.

In witness whereof I have hereunto signed my name this fifth day of January, 1918, in the presence of two subscribing witnesses.

PETER 'SCHMID.

Witnesses:

WALTER E. BUNDY, AMAND Emma. 

